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I can't speak for the Orange, but I have an SVT-7 PRO and it's a great amp at 15 lbs, 1000 watts, onboard compressor, both speakon and quarter inch outputs. However, I slightly prefer the sound of my GK 1001RB-II over the Ampeg. Maybe that's because I'm not using Ampeg cabinets. I think in general (and there are probably many exceptions to this rule) you'll get optimal sound if your cabinet and head are the same brand. I'd think an Orange head may sound best with an Orange cabinet.

Have not tried the 1000 but I've tried a few other Orange amps, and they all seem to get that same ratty raw sound that Orange is known for. I like it sometimes, but when I don't, there didn't seem to be anything I could do about it, so for that reason I'd go with a 7 Pro or PF800.